Single walled test piece

by dmatsumoto, published

Single walled test piece by dmatsumoto Jan 22, 2010
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I was trying to dial in my Cupcake using da3v's single walled test piece, and for some reason my Cupcake started to print the design really strangely as I tweaked the settings. Eventually, even restoring the default settings would result in a print with weird blobs and the stage would orbit a lot, even though my first five prints with the same STL file were great.

Anyhow, it sounds like the problem is with my Skeinforge settings not liking the smaller wall sizes. Just to keep things consistent, I remade the part in Alibre Design to have 0.5mm walls all of the way around. The rounded corners have a constant 0.5mm thickness as well.

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This script didn't work for me. In fact it cracked my build platform (Makerbot). Since I am a total newbie at this I don't understand why it didn't work right. But here's what happened:
I calibrated the extruder to zero Z very close to the build platform. All my calibration checked out. All motors move the build platform as expected. So I run the script. It warms up the extruder. Then it starts moving the extruder DOWN and plunges the nicely heated nozzle right into the platform which now has a nice hole. Isn't this script supposed to lift the extruder up 20mm for heating up first?

Similar here.

On the first run it crashed the nozzle into M3 bolt on top of the ABP.

So I manually centered the platform and tried again.

This time it moved the nozzle down perfectly, then raised it a few centimeters. Then it crashed the nozzle in to the ABP while moving the ABP in the X plane. :(

Is this the first print you've made on your machine? The only thing I can think of is that your start.txt file is messed up, so you've got some extra M codes in there that you don't want.

Hi Peter, it's something in your skeinforge settings that caused this, and not the STL file posted here. Take a look at your start.txt file in the skeinforge folder and check the gcode commands. I had a similar issue before when I ran skeinforge from GitHub.

You have a script I made for calibration available here:

It will generate single wall object with or without raft using parameters you provide (temperature, speed, height...). It is ideal tool for making fast tests of the head speed vs extrusion speed for selected layer thickness (of course if you have selectable extrusion speed)

hope it helps

lotu - in reply to Guest

This script as it is today it not safe to copy and paste blindly into your makerbot. Two problems I see in it are that it turns on the extruder and then sets the temperature. If your print head isn't already hot you could do damage to your bot. Also it dose not appear to wait for the extruder to get to temperature before doing it's work.

If you know what you are doing you can fix this but you have been warned

Can this Link be use for Makerbot ?

why not? You cannot get same level of accuracy if you are running DC extruder (rapman uses stepper driven extruder) but everything else is pretty much the same

awesome!!! thank you, I will check it out.