First of all - long time user, long time reader of the forum, own 2x M200's (one with Z-temp), so please don't take my post as one of a noob :)
I'm printing using Z-ABS
Angle Support: 20 (lite)
Fan Speed: tried all, though 0% works best for this part.
Surface Layers Top/Bottom: 5
Smart Bridges Enabled
V2 Perf Plate
I've been having trouble recently with my M200 printing large parts. I'd like to talk about 2 issues, which are probably connected.
1. The temporary Extruder Temperature drop after printing the raft.
2. The Warping of parts.
To use an example I thought I'd post one of the worst cases I've seen. Please see attached STL "Rig 2". This Flange takes up most of the print bed and I've never been able to print it without it warping and having horrible looking surfaces.
When the raft is finished being layed down (perfectly every time btw), there is a temporary Temperature drop in the extruder. I'm assuming this is to make the part easily separable from the raft when the print is done. In other words, the extruder wants to heat the first 'part' layer just enough to stick to the raft and no more. Whereas every other layer of the print is nicely bonded together at the appropriate temperature (~275 Degrees C for Z-ABS).
Now please look at photo 1. You can see the stringing effect that this causes. The extruder has cooled down temporarily, and the first 'part' layer has started to be layed down. However the temperature is not high enough to sufficiently 'bond' this layer to the raft. Each pass of the extruder lays down a line which is literally free to move. Some of these lines can cross over each other as well which causes every subsequent layer to be uneven. If the print was to keep going, the end result will look like Photo 2. As you can see the top layer is terribly uneven. I've seen plenty of posts about stringing on here and how to solve it, but little about what causes it in the first place!
How would any of you combat this issue for a part like this? Please feel free to print the part and see how you get on with this issue.
This is a oldy but a goody! I'm assuming Zortrax has realised how bad the M200 is at utilizing the entire bed for large parts - hence inventure's ridiculously small print bed! Anyway - I've invested this much time into the M200 I'm determined to make it work. For this part I've obviously calibrated the bed just prior to printing, put doors on the sides, got the room temp at a constant (~22 degrees C). By the way I'm convinced the room temp is a huge factor in warping - I know some of you 'advanced user's' aren't convinced ;). Sometimes I use glue stick but since investing in the V2 perf plate, I haven't bothered. (I should point out that most of the parts I print are small and don't need it). Also, I haven't used glue stick in the Rig 2 part - The vast majority of the warping I've seen on this part is due to the aforementioned 'extruder temp drop' issue above. So the part warping off the raft as opposed to raft warping off the bed.
See Photo 3. Rather than bitch about this result - I thought I'd suggest something constructive for M200 users. I propose we make a check-list of variables which every user can tick off to try and combat the warping issue.
What do you guys think?
Lastly, if anyone can print the part above successfully then please let me in on the secret. Thanks for reading :)