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DIY Electric Burr Grinder

by TeepSmart Inc.

JavaPresse Manual Burr Grinder TeepSmart Electric Burr Grinder

Ditch that exhausting handle!

High-quality electric burr grinders are expensive, but manual ones are much more affordable. I wanted to see if I could turn my manual grinder into an electric one.

Make It!

  1. How it works
  2. Bill of Materials
  3. CAD for 3D Printed Parts
  4. Comparison to Commercial Grinders

How it works

I little backpack for your burr grinder.

All I really did was connect a motor to the grinder via a timing belt and pulleys.

Electrical Assembly Super simple wiring (Make the motor turn the right direction)

Bill of Materials

For $86, you too can have a slow, loud, low-capacity burr grinder!

Everything in this project came from When buying hobby-grade things on Amazon, you often have to buy things in packs of several (for example, you can’t just buy one DC barrel jack, you have to buy a pack of 12). As such, the “Amazon Price” here is the price of purchasing the packs of several parts, and the “Price for This Build” is only for the correct number of components, not counting the leftovers. You can always use the leftovers for another project (that’s how you become a packrat like me)!

Part Qty Amazon Price Price for This Build Link
JavaPresse Manual Burr Grinder 1 $39.95 $39.95 Item
Timing Pulley 1 $6.89 $6.89 Item
Timing Belt 1 $6.58 $6.58 Item
Bearings (1/4”x5/8”x0.196”) 4 $8.95 $3.58 Item
DC Motor (12V, 50RPM) 1 $15.49 $15.49 Item
Power Supply (24V) 1 $9.69 $9.69 Item
DC Power Jack (Barrel Jack) 1 $7.99 $0.67 Pack of 12
Power Switch 1 $5.99 $1.20 Pack of 5
Velcro Straps 2 $9.55 $0.80 Pack of 24
Neoprene Sheet 1 $15.99 $1.50 Assortment
M3 x 30mm Screws/Washers/Nuts 2 $0.00 $0.00 Assortment
Totals   $126.08 $86.34  

CAUTION: Poor design choices

To get enough torque, I’m running a 12V DC motor at 24V. It heats up pretty fast, and it will probably ruin the motor a lot faster (there’s a reason voltage ratings exist). In a future redesign, I’d spec a motor with a higher gear ratio so I can run it at the right voltage. That would give up speed, but be a lot safer. The Amazon link above has several variants with different gearboxes. I’d probably go for the “20 RPM” or “30 RPM” option next time (or ditch DC motors alltogether).

CAD for 3D Printed Parts

Check out the Fusion360 model

I’d recommend printing this out of PETG or ABS. PLA gets soft at low enough temperatures that nothing will remain tight as the motor heats up (speaking from experience here).

Comparison to Commercial Grinders

Name Description Price Link
Baratza Encore The “highest regarded cheaper coffee grinder” $140 Amazon
Capresso Infinity Another “good brand” $100 Amazon
TeepSmart Electric The “I did it for cheaper” special $86