According to the Zortrax blog, one of the improvements in 2.6.1 for M200+ is better bed adhesion. Very much true.
Under Z-Suite 2.6.0 i figured out a (more or less repeatable) ABS-juice treatment that served well for large Z-ABS prints:
- juice formula: 1g/25 ml acetone
- application before each print: 10 drops of juice on a (car-waxing) cloth per 100 cm2 bed, quickly applied to each needed 100 cm2 bed “zone”.
With this procedure, and using the HEPA Cover on low fan speed, results were practically ideal with Z-ABS: no lifting of corners, raft detaches semi automatically (with some crackling sounds) upon reaching room temperature after printing.
In my latest 180x180 mm Z-ABS print (using Z-Suite 2.6.1) i used the above procedure which resulted in different behavior. Raft feels now "welded" to the bed. Removal requires a very sharp tool. Several of the spikes anchored in the perforation holes get broken/cut off and remain in the bed.
Reason for this change is apparently a more agressive first layer (maybe by lower layer height and/or greater plastic flow and/or higher temerature)
Some measurements on a raft by Z-Suite 2.6.0:
anchor spike depth (penetration of plastic into bed perforation): 0.4 mm
width of first-layer trace: 1.4 - 1.6 mm
Raft by Z-Suite 2.6.1:
anchor spike depth: 1.0 up to 1.4 mm
width of first-layer trace: 1.7 - 1.9 mm
The new adhesion strength is great but also requires a different way of preparing the bed. I think that ABS juice could almost be omitted now, replaced by only a wipe with pure acetone.