I've been looking for gears!!!

Inkscape can make gears and then export a dxf.   Make Magazine had a tutorial,  if you Google Inkscape,  gears and Make it should turn up.

1:10 is a big ratio for gears - and big ratios means worse vibration at speed, poor space usage and weak teeth in the pinion. Also, 10t is pretty small for standard metric module gears, interference kicks in about here - I use it as a bare minimum normally.

Try splitting it into two back-to-back at 2:7 and 7:20. (both as close as possible to 1:sqrt(10), which makes each reduction use very similar sized gears, but also picked for a reason which will become obvious below).

Not sure exactly what this is going into, but for funsies, you could even make the input/output axial by making the tooth count for each pair equal, as per the following working:

• LCM[ (2+7), (20+7) ] = LCM[9,27] = 27 (use this as initial tooth count for each pair)

• 2:7 * 3 = 6:21 (total 27)

• 7:20 * 1 = 7:20 (total 27)

• Let's multiply by 2 to make that 6t gear turn into a 12t: 12:42 and 14:40

• For a module 1 the PCD (pitch circle diameter) is m*t = 12, 42, 14, and 40mm. OD of the gear is usually this +2m, so 14,44,16,42mm.

• The total largest linear outside distance will be (t1+t2+2)*m = (54+2)*1 = 56mm

• Axle spacing should be (t1+t2)*m/2 = 54*1/2 = 27mm

Thus, by splitting it into two you can do a 1:10 ratio in the same space as pirvan's M0.5 gears, with the nearly-printable M1 tooth size, the input and output coaxial, the smallest gear is a respectable 12t, and the helpful/conventional property that each gear pair shares no prime factors in the tooth count (other than 2) which makes wear very even!