The STEMFIE Desktop Catapult is perfect for shooting ping-pong balls or crumpled paper. The ball-holding beam moves using the energy stored by two rotor springs. To arm this catapult, you rotate the beam until it locks into place held by the trigger.
You can shoot ping-pong balls into cups or hit and flip the STEMFIE shooting target, which is included in this project.
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| 70 |
4 < 160 x 160 mm |
A ping-pong ball or similar size and weight, such as a ball made of crumpled paper. | 20 minutes |
Spanner (SPN-TOL-0004) Driver (SPN-TOL-0001) |
Download the STEMFIE files below by right-clicking on a link and saving it on your computer. You can also download the ready-made build plates.
- Beam AGD ESS USH SYM BU05x10x01 - SPN-BEM-0347 (1x)
- Beam AGD ESS USH SYM BU07x10x01 - SPN-BEM-0385 (1x)
- Beam STR BXS ESS BU03.00x01.00x01.00x00.25x00.125 - SPN-BEM-0009 (1x)
- Beam STR ESS BU07x01x01 - SPN-BEM-0044 (1x)
- Beam TSH SYM ESS BU03x08x01 - SPN-BEM-1006 (1x)
- Holder SPH LOP BRG-SCT INR-DIA BU02.50x02.00x01.50x01.25 - SPN-HLD-0007 (1x)
- Holder Trigger BEM BU07x03x00.25 - SPN-HLD-0200 (1x)
- Knob KNR BVD SCR ISR BU01.50x01.00 - SPN-KNB-0001 (1x)
- Nut PH CL BU01.00x5mm - SPN-NUT-0018 (1x)
- Nut RH BRL CRS SYM ERHRH BU03.00x01.00 - SPN-NUT-0056 (1x)
- Nut RH BRL CRS SYM ERHRH TRH-H BU03.00x01.00 - SPN-NUT-0073 (1x)
- Nut RH BU01.00x01.00 - SPN-NUT-0005 (2x)
- Nut RH BU01.00x5mm - SPN-NUT-0001 (11x)
- Pin CL RHD BU01.50 - SPN-PIN-0046 (1x)
- Pin SPP INR LCT BDR BU01.00x00.50 - SPN-PIN-0094 (1x)
- Screw FL-RH RHD BU08.00 - SPN-SCR-0112 (1x)
- Shaft PLN BU07.75 - SPN-SFT-0031 (2x)
- Shoulder Screw RHD RH BU01.50 - SPN-SSC-0046 (3x)
- Shoulder Screw RHD RH BU01.75 - SPN-SSC-0047 (5x)
- Shoulder Screw RHD RH BU02.25 - SPN-SSC-0049 (2x)
- Shoulder Screw RHD RH BU04.25 - SPN-SSC-0057 (4x)
- Shoulder Screw RHD RH BU05.00 - SPN-SSC-0060 (1x)
- Sign URL SLTD LAY USH BU05x04x02 - SPN-SGN-0010 (1x)
- Sign URL SLTD STA USH BU05x03x01 - SPN-SGN-0009 (1x)
- Spacer FRE BU02.00x01.00 - SPN-SPR-0057 (2x)
- Spacer FRE BU03.00x01.00 - SPN-SPR-0061 (2x)
- Spring RTR BU05.00x01.00 E-BU01.00x01.00-BUH REV2.5 T2mm - SPN-SPG-0005 (2x)
- Target Tipping BU05.25x03.00 - SPN-TRG-0001 (1x)
- Washer FRE BU01.00x00.25 - SPN-WSR-0038 (5x)
- Washer FXD BU1x0.25 - SPN-WSR-0001 (11x)
- Tool Driver NUT SCR PIN THR - SPN-TOL-0001 (1x)
- Tool Spanner NUT - SPN-TOL-0004 (1x)
- Instruction URL sign
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Right-click and save the following build plates (.3mf file format).
- Gray - Springs, trigger, screws, beam, knob
- Orange - Nuts, washers, sing, holder, target, shafts
- White - Beams, the target base
The files for this and several other STEMFIE projects are available from the central web file repository. Also, if you prefer to have the files synchronized to your computer, consider subscribing to the STEMFIE cloud repositories. For instance, you can clone the STEMFIE GitHub File Repository to your local hard drive and get all updates when you synchronize.
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This toy is unsuitable for children under three years due to choking hazards! 
