The proposed OFP sensor was fabricated by combining a 3D printed finger body (3D Printer: Projet MJP 2500, 3D Systems Inc., Rock Hill, SC, USA) and fingertip to mimic the human finger structure, where the fingertip surface was made of silicone elastomer (Ecoflex 0050, Smooth-On Inc., Macungie, PA, USA), providing a highly elastic soft structure as shown in Figure 1 . The Ecoflex 0050 is a material with a Shore hardness = 00−50 and 100% tensile modulus of 83 kPa. Furthermore, it exhibits elastic or skin-like properties [44 (link),45 (link),46 (link)] in all directions and thus can imitate realistic human-like fingertip surfaces. In addition, a cone-shaped tunnel was designed inside the silicone elastomer to allow the magnet (Nd-35 with a diameter of 5 mm) slider to move back and forth repeatedly according to the applied pressure, as described in Section 2.1 .
Projet mjp 2500
Manufactured by 3D Systems
Sourced in United States
The ProJet MJP 2500 is a 3D printer that uses MultiJet Printing (MJP) technology. It has a build volume of 294 x 211 x 144 mm and can produce parts with a resolution of 600 x 540 dpi. The printer is capable of printing with a variety of materials, including VisiJet M2R-CL and VisiJet M2R-HT.
Automatically generated - may contain errors
3 protocols using projet mjp 2500
1
Fabrication of Soft Silicone Fingertip Sensor
2
3D Printing of Microarray Holders
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Fusion360 and SketchUp computer aided design (CAD) software was used for designing the MAs and designs were exported to an object file (.stl) using 3D Sprint (3D Systems, Inc., Rock Hill, SC, USA). The print resolution is highest in the z direction which is 0.02 mm. MA holders were 3D printed using a commercially available ProJet MJP 2500 printer (3D Systems, Inc.) using a VisiJet® M2R-CLR build material and a VisiJet® M2 SUP support material, both from 3D Systems. After printing, the MA holders were placed at −20 °C for 5 min to release the printed holders from the base plate. MA holders were then placed in a steam bath for 15 min to remove the wax support material and subsequently placed in a hot oil bath for another 15 min to remove all traces of the wax support. MA holders were then cleaned using hot tap water and soap and left at room temperature to dry.
3
Customized Headpost and Cranial Window Implants
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Headpost implant design was adapted from Ghanbari et al. 55 , and consists of a custom-made Titanium or Stainless-steel head-plate, a 3D-printed frame, and three 0-80 screws to hold the frame to the head-plate.
We fabricated the head-plate with Titanium or Stainless-steel plate (McMaster-Carr) using a waterjet system (OMax), and 3D printed the frame using a ProJet MJP 2500 (3D Systems). Our design files can be found online (https://github.com/ckemere/TreadmillTracker/tree/master/UMinnHeadposts). We assembled the headpost implant after tapping the 3D printed frame with 0-80 tap and securing the headplate over the frame with three screws. The entire headpost is then stored in 70% Ethanol prior to surgery.
Cranial window fabrication procedure was adapted from Goldey et al. 56 . Windows were made of 2 stacked round coverslips (Warner Instruments # CS-3R, CS-4R, CS-5R) of different diameters. To fabricate the stacked windows, a 3 mm (or 4 mm) round coverslip was epoxied to a 4 mm (or 5 mm) cover slip using an optical adhesive (Norland Products Inc. e.g. # NOA 61, 71, 84) and cured using longwavelength UV light. To accommodate the large 5 mm stacked window, we cut off the right side of the 3D-printed frame to allow for extra space for the C&B Metabond to bind to the skull outside of the stacked cranial window. Fabricated stacked windows were stored in 70% ethanol prior to surgery.
We fabricated the head-plate with Titanium or Stainless-steel plate (McMaster-Carr) using a waterjet system (OMax), and 3D printed the frame using a ProJet MJP 2500 (3D Systems). Our design files can be found online (https://github.com/ckemere/TreadmillTracker/tree/master/UMinnHeadposts). We assembled the headpost implant after tapping the 3D printed frame with 0-80 tap and securing the headplate over the frame with three screws. The entire headpost is then stored in 70% Ethanol prior to surgery.
Cranial window fabrication procedure was adapted from Goldey et al. 56 . Windows were made of 2 stacked round coverslips (Warner Instruments # CS-3R, CS-4R, CS-5R) of different diameters. To fabricate the stacked windows, a 3 mm (or 4 mm) round coverslip was epoxied to a 4 mm (or 5 mm) cover slip using an optical adhesive (Norland Products Inc. e.g. # NOA 61, 71, 84) and cured using longwavelength UV light. To accommodate the large 5 mm stacked window, we cut off the right side of the 3D-printed frame to allow for extra space for the C&B Metabond to bind to the skull outside of the stacked cranial window. Fabricated stacked windows were stored in 70% ethanol prior to surgery.
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