Most of the custom parts for the Drawbot are designed to be laser-cut from 1/8 inch acrylic. The plastic will run about $20-$30, excluing cutting.
| Part | Quantity | Price Each | Source |
|---|---|---|---|
| Arduino UNO | 1 | $29.95 | http://www.adafruit.com/products/50 |
| Adafruit Motor Shield | 1 | $19.50 | http://www.adafruit.com/products/81 |
| NEMA 17 Motor | 2 | $14.00 | http://www.adafruit.com/products/324 |
| End Stop Switch | 2 | $1.95 | http://www.adafruit.com/products/819 |
| Micro Servo | 1 | $5.95 | http://www.adafruit.com/products/169 |
| Servo Extension Cables | 2 | $2.50 | http://www.adafruit.com/products/973 |
| 608 Skate Bearings 8-Pack | 1 | $7.75 | http://www.amazon.com/dp/B001U7MQPO |
| M3 Screws 20mm | 1 | $4.00 | <mcmaster.com> 92095A185 |
| M3 Screws 12mm | 1 | $5.13 | <mcmaster.com> 92095A183 |
| M3 Screws 6mm | 1 | $5.06 | <mcmaster.com> 92095A179 |
| M3 Nuts | 1 | $1.39 | <mcmaster.com> 90591A121 |
| Open Beam 6-Pack | 3+ | $64.99 | http://www.amazon.com/dp/B00C444G6O |
| Timing Cable* | 7+ | $2.00 | http://openbuildspartstore.com/ |
| Timing Pulley (5MM Shaft) | 1 | $4.50 | http://openbuildspartstore.com/ |
If you have access to a 3D printer, you might want to 3D print the pen holder, or you can mount a pen to the servo in another way. We used rubberbands and tape before we printed the pen mount.
We also printed our own timing pulley, instead of ordering it.