I'm running a 17HS16-2004S1 motor with a MK7 gear as a extruder,

3D Printing
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I’m running a 17HS16-2004S1 motor with a MK7 gear as a extruder, however the motor is skipping steps with the A4988 set at 0.8v, how far can I push the voltage?

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Short answer, Till the heat shuts it down. I use a Bowden setup and needed a 4:1 gear box, so I printed one. Now it works great.

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I guess you mean how far you can push the current and it’s at 0.8A now? The model you listed is rated to 2A.
Other than that, what Jeremiah said. Rule of thumb is generally not to push it beoynd a temp of 80 C.

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@Johan_Jakobsson No it is set at 0.8 volts at present, basically a new build for a friend and I want to make sure it;s right before handing it over.

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@Jeremiah_Coley Yeah this is a bowden setup too, what gearbox did you get?

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@The_Hozza I am on my phone, so I didn’t have any luck looking for the thingiverse model… Mine is a custom redesign… If I get time today I will post it and link it here. I have been using mine for over a year now without issues. Sounds like you have a similar setup and it turns a terrible extruder into one will balls. (If I haven’t posted by tomorrow ping me here as a reminder, need to upload to thingiverse anyway.)

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@The_Hozza Looking at the specs for the A4988 it’s rated at 8-35V. You sure you’re running it at 0.8v? Seems strange, most 3dprinters use 12 or 24 volts…
As for current it’s maximum 1.0A per phase for continuous use.

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Take a look at this wiki. Here your 0.8V is the vref. Calculate how much ampere your driver is giving to the steppermotor and compare that to what your motor is rated for.
http://reprap.org/wiki/Pololu_stepper_driver_board

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@The_Hozza here is the Planetary Gear Box I use, sorry if the Instructions are lacking, but I was in a hurry. If you have any question regarding it let me know. http://www.thingiverse.com/thing:2327953

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@The_Hozza ​ here is a “Titan” printable extruder I believe it is 3:1 and the V^3 is 4.1:1
Drakon Geared Extruder found on #Thingiverse Drakon Geared Extruder by AxMod3DPrint - Thingiverse

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Thanks for all the feedback, I’ll look into all the options and will report back once I have some results.