ABSTRAK Mesin 3D printing dapat membuat proses produksi menjadi singkat dan sederhana, keunggulan ini menjadikan banyak peneliti mulai menggembangkan mesin printing. Pengembangan mesin printing yang sudah dilakukan salah satunya adalah mesin 3D printer 2 x 2 x 2 meter. Keberhasilan mesin printing dapat dilihat dari hasil printing yang sesuai dengan desain yang diharapkan. Oleh karena itu, diperlukan aplikasi yang dapat membantu merancang desain objek 3D pada mesin printer 2x2x2 meter, salah satunya menggunakan aplikasi CAD (Computer Aided Design) “SolidWork”. Aplikasi “SolidWork” bersifat opensource yang dapat membantu mengetahui pengaruh desain 3 dimensi menggunakan software CAD terhadap jarak, sudut dan skala objek pada mesin printer 2x2x2 meter. Desain objek 3D “SolidWork” disimpan dalam dalam format file STL, kemudian diproses di dalam Simplify 3D, objek akan diiris secara software. Hasil irisan gambar 3D akan menghasilkan sebuah file G-Code. Output koordinat dari G-Code digunakan untuk menggerakan motor stepper. Hasil cetak objek 2D memiliki error ukuran bentuk segitiga 4,62%, bentuk straight slog 7,49%, bentuk oval 5,54%, error sudut sebesar 0% dan error skala objek 0%. Sedangkan untuk objek 3D memiliki error rata – rata sebesar 0,29%. Berdasarkan hasil pengujian aplikasi “SolidWork” dapat menujukkan kinerja mesin dan membantu dalam pembuatan desain 2D dan 3D pada mesin 3D printer 2x2x2 meter di Lab Elektro Prodi Elektronika Politeknik Negeri Malang. ABSTRACT 3D printing machines can make the production process short and simple, this advantage has made many researchers start to develop printing machines. One of the developments in printing machines that have been carried out is the 2 x 2 x 2 meter 3D Printer machine. The success of the printing machine can be seen from the printing results by the expected design. Therefore, an application is needed that can help design 3D object designs on a 2x2x2 meter printer machine, one of which is using the CAD (Computer-Aided Design) application "SolidWork". The application "SolidWork" is open source which can help determine the effect of 3-dimensional design using CAD software on the distance, angle, and scale of objects on a 2x2x2 meter printer machine. "SolidWorks" 3D object design is saved in STL file format, then processed in Simplify 3D, the object will be sliced ​​automatically. The sliced ​​3D image will produce a G-Code file. The coordinate output from the G-Code is used to drive the stepper motor. The printout of 2D objects has a triangular size error of 4.62%, a straight slog shape of 7.49%, an oval shape of 5.54%, an angle error of 0%, and a scale error of 0%. Meanwhile, 3D objects have an average error of 0.29%. Based on the results of testing the "SolidWork" application can show machine performance and assist in making 2D and 3D designs on a 2x2x2 meter 3D printer machine at the Electrical Lab of Electronics Study Program, State Polytechnic of Malang.

3-Dimensional (3D) Printing Technology (3D printer) has become a Standard Acceleration Tool for Industry 4.0. Until now, 3D Printing system material melting technology has been using Fused Deposition Modelling (FDM) method. FDM is the melting of plastic materials through melting temperature and the formation of 3D objects in layer by layer manner. Meanwhile, the feeding for melting material is in the form of rolling filament. Currently, in this research FDM uses plastic pellete feeding method. Its exstrusion is called extruder, that is, plastic pellet processed through heater zone and pushed out by screw to the nozzle where the nozzle is a Computer Numerical Control (CNC) drives 3-Degree-of-Freedom (3DOF) applying cartesian axes. In this research, the printing uses high density polyethylene plastic pellete (HDPE). Temperature control in melting heater using proportional-integral-derivative (PID) method is controlled by microntroller and programmed through marlin firmware. The design and implementation result showed that the extruder system is capable to melt HDPE pellet at 200°C with heater power 300Watt and the screw can rotate to push out melted plastic at 2mm of nozzle.

Three Dimensional Printing (3DP) is one of the technologies that support industry 4.0. One of the common 3DP technology is FFF (fused filament Fabrication), the technology is also known as Fused Deposition Modelling (FDM). In this case, extrusion thermoplastic through a hot nozzle with certain melting temperature. The extrusion machine (extruder) will melt the plastic pellet and push the pellet through a heating zone that has a different temperature and pushed out by a screw to the nozzle to be printed into objects. This research aims, to make a control innovation for plastic pellet feeding double extruders. Those extruders for a bilateral 3DP symmetrically to print an object with a size of 2000x2000x2000mm using FDM method. The research simulation results showed that the extruder melts the plastic pellets with a temperature of melting is 200°C, temperature controlled by PID. In this research using 4mm plastic pellets diameter polyethylene high density (HDPE). The double extruders is controlled by two stepper motors Y- and Y+ axis with speed 70mm/s, on 2mm nozzle diameter. The extruder can be produce 110mm melted plastic filaments in 250 steps.

Obstructive sleep apnea (OSA) atau sleep apnea adalah gangguan tidur langka yang memerlukan penggunaan sinyal aktivitas listrik, biasa disebut sebagai elektrogram (ECG), untuk dideteksi. Sinyal ECG terdiri dari bentuk gelombang, durasi, ritme bentuk gelombang, dan orientasi sinyal, yang dapat digunakan ahli jantung untuk mengevaluasi kondisi jantung pasien. Tujuan dari penelitian ini adalah untuk mendeteksi sleep apnea menggunakan dataset ECG yang ada. Sistem pendeteksi sleep apnea ini diharapkan mampu mendeteksi gangguan pada pasien secara dini dan membantu dokter mendiagnosis pasien secara lebih akurat dan cepat sehingga dapat memberikan penanganan lebih lanjut. Penelitian ini mengusulkan bagaimana mendeteksi sleep apnea dengan perangkat lunak dengan menggunakan parameter statistik dari sinyal interval RR dalam dataset sinyal ECG dan kemudian mengklasifikasikannya menggunakan metode DecisionTree. Proses deteksi sleep apnea yang peneliti usulkan menggunakan interval RR dan proses decision tree memiliki tingkat akurasi 99,5%.

In Indonesia Rosella Flowers are used as herbal tea. The process of brewing Rosella Tea is brew 3 – 4 dried rosella petals with 200ml hot water. This brewing process takes a long time from 10 minute or 15 minute. One of way to improved is crushing the rosella flower to little shape with apply PID method. This machine use Atmega32 as controller, speed sensor, laser sensor, and DC Motor as actuator. The working principle of this machine is to stabilize DC motor speed, effective procces is at 900 RPM, in this speed takes 07 minutes 15 seconds to finished the process, and laser sensor has not detected rosella flower to crushing the system will turn off automatically. With percentage overshoot  10.2 %,  settling time 245 seconds, and biggest error of speed sensor is 2.6 % . The reuslt from speed sensor will display at LCD 2*16 to make easily to analysis.