Introduction of digital technologies has a pivotal role in modernization and improvement in the field of education. Development of new digital technologies and their adaptation for application in the classroom have enabled new ways of teaching and learning. One of these technologies is 3D modeling and printing (3DMP
1). In the process of 3DMP, a computer (software) model-designed format is created into a 3D object adding materials layer-by-layer. There is a large body of research that indicates that the use of 3DMP in education has certain benefits, especially in the fields of science, technology, engineering, and math (STEM). For example, Berry et al. (
2010) concluded that using 3DMP in education could increase student engagement, inspire creativity, and improve attitudes towards STEM subjects. Several studies have documented that 3DMP contributes to student skills in technical drawing, product design, and development (Lütolf,
2013; Steed & Weevers,
2016). Some of the research recognizes the important role played by 3DMP in achieving the STEM learning goals in schools. Research that confirms this was conducted by Grant et al. (
2016) and showed that during the modeling of animal parts in biology classes, students implemented knowledge from other subjects such as computer science, mathematics, and engineering, which lead to achieving STEM learning goals. A similar conclusion was reached by researchers investigating the contribution of 3DMP in chemistry (Brooks,
2016), physics (Dumond et al.,
2014), mathematics (Bull et al.,
2015), computer science (Minetola et al.,
2015), and technological education (Martin et al.,
2014). Some research indicates that 3DMP contributes not only to the learning process but also to the teaching process and to the teachers who use it. The results from studies of Horowitz and Schultz (
2014) and Ford and Minshall (
2019) demonstrate that 3DMP contributes to teachers’ interest and engagement in STEM and that 3DMP increases their abilities to adapt the content they teach to their students’ capabilities. In the latest research on this topic by Arslan and Erdogan (
2021), it was found that the application of 3DMP contributes to the development of more positive attitudes of teachers over its application and impact on learning. The teachers stated that 3DMP transforms abstract concepts into concrete visual representations, facilitates learning and enables longer knowledge retention, makes lessons enjoyable, and strengthens interest, creative thinking, and design skills, as well as motivation to create different educational materials for certain contents. Another study establishes that 3DMP represents an ideal supplement technology in teaching, because teachers are able to create original learning materials, which are not easily accessible and available (Karaduman,
2018). However, in opposition to the studies listed above, the findings of Bull et al. (
2015) and Kitts and Mahacek (
2018) differ. They concluded that teachers are still unable to fully utilize the benefits of 3DMP, due to the lack of adequate guidance on the use and maintenance of 3DMP, as well as the lack of understanding of processes required for the implementation of this teaching tool. This is in line with the results of Nemorin (
2017) and Nemorin and Selwyn (
2017), who stress that teachers could face serious obstacles in the implementation of 3DMP in teaching, which could further lead to frustration, physical fatigue, mental exhaustion, tedium, and anxiety. For example, research by Arslan and Erdogan (
2021), Karaduman (
2018), and Maloy et al. (
2017) confirmed that the teachers faced challenges in applying 3DMP, because of the lack of multidimensional and creative thinking skills, which are necessary for designing 3D learning objects. In addition, the teachers in these studies were limited in the use of these facilities due to internet disconnects, occasional power outages, and insufficient knowledge of 3D-printer use in practice, as well as insufficient online models available due to their limited number. These are some of the reasons why a number of teachers do not want to apply 3DMP in their practice, which is directly reflected in the lower representation of these models in learning. Additionally, the results from recent studies demonstrate that research examining teacher perceptions, opinions, and conceptions about using 3DMP in education is uncommon. They suggest that research in this area should be intensified, in order to obtain a clearer picture of the application of 3DMP in practice and to take adequate steps to promote, train, and raise awareness of teachers on the importance and benefits of applying 3DMP in teaching and learning (Arslan & Erdogan,
2021 Karaduman,
2018; Maloy et al.,
2017; Simpson et al.,
2017). It is especially important to examine the attitudes, opinions, and conceptions of STEM teachers on the implementation of 3DMP in teaching, taking into account that previous research indicates not only the benefits of 3DMP application but also the unsatisfactory experiences of teachers, which encourages them to stop using 3DMP in practice. If we have in mind that the successful introduction and use of technologies in education mostly depends on teachers’ conceptions, perceptions, and opinions about them (Kafyulilo et al.,
2015), then the importance of examining teachers’ opinions and conceptions about 3DMP is clear. To our best knowledge, there is no research that examines conceptions of STEM upper primary school teachers on 3DMP. Our research seeks to contribute to the knowledge in this area and assist in filling the literature gap.
This prospective study was designed to investigate how 3DMP is experienced by STEM teachers in upper primary schools in Montenegro, and uncover teachers’ conceptions on 3DMP as a teaching tool, with the focus on identifying potential differences among the categories. In accordance with the aim of the study, research questions were developed. This research seeks to address the following questions: what are the qualitatively different conceptions of STEM teachers who experience 3DMP in teaching and if there are differences in the conceptions on the use of 3DMP in teaching of teachers who teach different subjects within STEM. The remainder of the paper is organized into the following sections: methodology—providing information on how phenomenographic research approach was used in our study, the results showing the conceptions of STEM teachers who participated in this research on 3DMP, discussion, and conclusion.
Procedures and Interviews
All of the teachers who participated in our study were primarily part of workshops about implementation of 3D modeling and printing in teaching as volunteers. The workshop lasted 8 h and was divided into the following parts: theoretical introduction about 3D modeling; theoretical introduction about 3D printers and printing; introduction to the implementation of 3DMP in education; practical 3D modeling for teachers; practical 3D printing of teachers’ models, discussion. The participating teachers’ schools were equipped with a 3D printer each after the workshop, for which the project funds were previously allocated to. The workshop trainers provided their contacts to the teachers to contact them in case of obstacles which they could not overcome on their own. One year after the workshops, and after the teachers acquired experience in the practical implementation of 3DMP in teaching, individual and focus group interviews were conducted.
The interviews took place in schools where the teachers worked. The moderator was skillful in group discussions and used interview guide and pre-determined questions. The interviews were first conducted individually with teachers, then these teachers were grouped into focus groups, which were also interviewed. During the focus group interviews, the moderator allowed the participants to lead the conversation in a direction that was of interest to them, but always attentively guided the interview to the main topic of 3D printers. At the beginning of their interviews, the participants were told that they do not have to agree or support someone’s opinion. It was emphasized that it is important to express their opinion based on personal experiences. The interviews lasted between two and two and a half hours. Three focus groups were made out of 9 teachers, and one was made with 10 teachers participating in it. With the implementation of four focus groups with this number of participants, we tried to ensure diversity and reliability of our data, which is recommended by Cohen et al. (
2017) and Patton (
2002). The interviews were audiotaped. This procedure provided the researchers with the possibility to collect the qualitative data, but also to get insight into the participants’ feelings, emotions, contradictions, and tensions, which are connected with the topic (Lundy-Allen et al.,
2004). The interview guide consisted of 20 open-ended questions. The interviews started with three general questions, followed by more specific ones. Some of the examples of general questions are as follows:
What is your experience of using a 3D printer in teaching?
What do you think about the added value of using 3D printing in teaching? and examples of specific questions are as follows:
Describe one learning activity in which you implemented 3D printing,
and everything went well?
How did you organize and prepare exercises where you used 3D printing in your lessons? The full list of questions used in this research is provided in Appendix
A.
Data Analysis
The phenomenographic approach (Marton,
1981) was employed for analyzing the teachers’ interviews. All of the interviews were transcribed at first and after that left aside for 2 weeks in order to create the distance for the researchers’ minds and enable them with a more open-minded data analysis (Trigwell,
2000). These transcripts were processed using seven-step phenomenographic analysis of data Han and Ellis (
2019), Dahlgren and Fallsberg (
1991), and McCosker et al. (
2004). This means that the data were processed in the following way:
Step 1—familiarization: The transcribed interviews were read and reread several times by the researchers in aim to be familiar with the data and its details, and to create personal notes about the information;
Step 2—condensation: To reveal data patterns, the most representative sample units were marked in the transcript.
Step 3—comparison: The representative sample units were compared to find sources of variation or agreement;
step 4—grouping: Sample units with similar traits were allocated and grouped.
Step 5—articulating: In this step, similarities within each category of sample units (statements) were described.
Step 6—labeling: The meaning of the categories was expressed linguistically.
Step 7—contrasting: A contrastive procedure was used for comparison between the obtained categories in aim to reveal their individual meanings and similarities, as well as the differences between them. Structural relations were used for establishing the hierarchy between the developed categories. In terms of offering an explanation of relationships between categories, multiple ways of experiencing the same phenomena, the structure of the “outcome space” was used (Åkerlind,
2005). Hierarchy establishment was based on the evidence that some categories were intertwined with others, as it is suggested by Åkerlind (
2005). The same authors claim that the confirmation of the hierarchy could be supported by logical and empirical perspectives, and both should be confirmed by the transcribed data. Based on this suggestion, we concentrated our transcript revision on the important ideas and claims and their level of manifestation in transcripts. For example, one of the participants said:
TET: Many teaching aids used in schools do not follow the development of society. A lot of the teaching aids used in Technical education and Engineering are no longer used anywhere in practice but are obsolete, retained only in schools. 3DMP would enable students and teachers as well, to work with modern technologies, which they are already surrounded by every day.
From this part of the transcript, “follow modern technology trends” was extracted as an important part to summarize the key meaning. Another teacher provided the following explanation:
ST: Modern educational games and applications enable today’s students to build entire cities and their inhabitants in a virtual space. Today, students spend a lot of time in such an environment. Then imagine the disappointment of one contemporary student, who in biology class then learns about heart from a poster or picture, like it was 100 years ago. The application of 3DMP enables the student to acquire knowledge in a modern and interesting way by combining virtual environment in which he spends a lot of time with the physical world and teaching materials.
From the passage above, “aligning with the needs of contemporary students” is formed as the main idea representing the meaning of the paragraph. Following the same principle, “key meanings” were extracted from all the parts of the teachers’ narrative, which were then compared with the aim of developing categories. Based on these principles, the above quotes and the others, which are described in the results section, are classified under category 1: 3DMP as a tool for classroom modernization. In the process of developing categories and their structural relationships, three rules suggested by Marton and Booth (
1997) and Han and Ellis (
2019) were followed: each category should reveal some distinctness from other categories about explored phenomena; categories should be parsimonious and present most important data; the categories in hierarchy relations should be clearly and logically specified. In the aim to explore and understand the potential difference in conceptions about 3DMP of teachers from different STEM subjects, the total frequency of the conceptions in the focus groups and frequency by individual participants were used. With this approach, we tried to adapt the recommendations about distribution of general, main, and achieved conceptions of teachers given by Tsai (
2009) and Hsieh and Tsai (
2017), as well as the recommendation of Irvin (
2006), who suggests using phenomenography to examine the conceptions of a collective group of participants instead of analyzing the understandings of individuals. In our research, the main concept category was determined based on the highest frequency in the narrative of the teacher focus groups and individual interviews. The category with the highest achievement was the one that was recorded in the teachers’ narratives and was regarded as the most sophisticated. Following the suggestions of a previous similar phenomenographic research (Marton & Booth,
1997; Åkerlind,
2005), the main concepts have been presented with categories that are logically related to each other. In terms of increasing complexity (from less to more complicated) from basic to sophisticated categories of concepts, the relationships between categories are posited to form a structural hierarchy of inclusiveness (Åkerlind,
2005). It is important to stress that the hierarchy is based on the evidence of some categories being inclusive of others, rather than on a value judgment (good or bad) (Åkerlind,
2005). This means that the highest category (the most sophisticated) is the most complete one, which includes the elements of less ranged categories (Khan et al.,
2019). For example, the fourth category—3DMP and student professional orientation, teacher professional development is hierarchically above the three lower categories. In this category, 3DMP is not only seen as a medium for modernization of the classroom, or as a teaching tool that improves technological information skills and the learning and teaching process, which is the case in the three lower categories, but also as contributing to students’ and teachers’ professional orientation and professional development. According to this principle, a hierarchical relationship was made for all the categories in this research.
Trigwell (
2006) suggests that the reliability of data in the phenomenography research could be achieved by easy recognition of the categories by others. The internal logic of the categories and their easy representation indicate the validity in the phenomenographic research (Marton,
1986). Validity and reliability can be achieved by applying the opinions of experts in this field, which are related to the developed categories based on the transcript (Cope,
2004). In this research, three colleagues with the experience in qualitative research and their opinions about developed categories were used for checking the reliability. A high level of agreement between the researchers and external experts (84%) indicates that the data in this study could be considered reliable (Säljo,
1988).