Tevo Tornado | Build plate bushing / stabilizer

thingiverse

Have you ever pondered the enigma of random banding only in the Y-direction? Read on - this may be for you! I removed the stock print surface to utilize my own (which is highly advised). After several hours of printing, I began wondering about some bizarre issues occurring only later in long prints in the Y direction. **Short version:** The Tornado has severe issues when you remove the original surface! The screw holes are far too large and the entire build plate just slips randomly after some rapid movements. To address this problem, I created a very simple bushing to keep the screws in place. Print it four times and you're good to go. **TLDR:** The original surface keeps it in place because the plastic cutouts fit the screw diameter more or less perfectly. However, even so, I think it may slip at some point. I took some measurements - just take a look at the photos and you'll find it self-explanatory ;). *Edit: Caused by friction, I think even movement in the X-direction might not be impossible!* I conducted a test run (see G-code photo) moving the Y axis back and forth 100mm for 6000 times at maximum speed (I dialed in 10000, but it's limited by firmware to something less). I took measurements before and after - with a devastating difference of .82mm. [Testrun here](https://youtu.be/2PzFAemEc2g) Note: the video is accelerated 3x. You may find the test case unrealistic, but I'm sure that after a lot of micromovements (like infill!) it slips *many* times in *random* directions! Source code included... but it's truly simple ;)