@nop_head I just tried it, spotlessly clean glass, even cleaned with pure acetone, got half way around the skirt and it started coming away 
Any advice? Z calibration is correct, I even measured the bed temp (albeit with a turkey thermometer, no idea if thats accurate) and it read 53 so it looks about right. Is it possible my faberdashery is out of spec?
I have no idea why it doesn’t work for some people. The kits and the plastic are all the same, so it probably comes down to impurities in the acetone or the wipe material. Some people swear by vinegar but others said it stuck so hard it broke the glass. Acetone and lint free wipes work for me.
Raise the temperature in 10 deg. increments till you find the sweet spot. If you get to 110C then it is a bit strange. I’ve never had any problems with PLA.
Vinegar? I might try that…
Yes, white vinegar is sold as a household cleaning fluid for glass
Yes white vinegar is sold as a household cleaning fluid for glass.
I’ll check out for that. I have a feeling its not available in the UK but I’m guessing we have an alternative.
I didn’t manage to find the glue stick but I did manage to find “Elmers Repositionable Mounting Spray” and it works great so far! Also its acetone based which means hopefully it will wipe off with acetone. It seems to stay sticky for ages as well. Just waiting for this print to finish so I can see how easy it is to remove and if I need to reapply each time.
Awww, didn’t work out, it wasn’t sticky enough and the print started curling up at the edges and was wrecked Tried the same print and it was fine with PVA. Oh well, it was worth a go
I’ve always had best success with dilute PVA, although I have recently given white vinegar a try and that seems to work reasonably well as well. Any chance you could share your settings for Kisslicer? That is the one slicer I have never managed to get completely dialed in for the Mendel90.
Raise the bed temperature to say: 90-100. I print PLA on bare glass at 90-100 in winter and at 60-70 during summer. With hairspray it works out very well at 80 for ABS and 50-60 for PLA.
You could also raise a bit the temperature of the hotend to about 190-195. Or at least the first layer.
It very much depends on the conditions you have at home (temp and humidity) and of course the type of plastic even it’s batch. You will have to try out the settings that will work out for you.
Thanks @F_Malpartida_fm , I tried raising the temps after your post but didn’t go as high as that or run a hotter hotend, I’ll have another go. The PLA is the faberdashery supplied by NopHead.
Raise the temperature of both hotend and heatbed in 5oC increments. The behaviour is very different from place to place and the conditions affect the print. Even during different seasons.
Try to squash a little the first layer, but not too much or you will deform the base.
@Phil_Evans my KISSlicer settings are as follows, backup your existing ini files (just in case) then append the following onto the end of each of the ini files in turn and it should add additional presets in the pulldowns for the Style, Material and Printer tabs (the Support tab you will need to configure for your print in question). The Ptr G-Code tab should fill in automatically with Nopheads famous x-wipe code when you select the Mendel90 in the Printer tab. Check the Select Extruder G-Code in the text box starts with “G1 X0 Y98 F9000 ; go to the front middle”.
If it works for you can you feed back to me and I’ll maybe let @nop_head know if he’s interested or Jonathan the KISSlicer developer?
_styles.ini:
[Mendal90 0.2mm]
layer_thickness_mm=0.2
extrusion_width_mm=0.4
num_loops=2
skin_thickness_mm=0.6
infill_extrusion_width=0.4
infill_density_denominator=3
stacked_layers=1
use_destring=1
use_wipe=1
loops_insideout=0
infill_st_oct_rnd=0
inset_surface_xy_mm=0
seam_jitter_degrees=0
seam_depth_scaler=1
[Mendal90 0.3mm]
layer_thickness_mm=0.3
extrusion_width_mm=0.4
num_loops=2
skin_thickness_mm=0.6
infill_extrusion_width=0.4
infill_density_denominator=3
stacked_layers=1
use_destring=1
use_wipe=1
loops_insideout=0
infill_st_oct_rnd=0
inset_surface_xy_mm=0
seam_jitter_degrees=0
seam_depth_scaler=1
_materials.ini:
[Faberdashery Green PLA]
g_code_matl=3B204D617962652073657420736F6D65206D6174657269616C2D737065636966696320472D636F64653F
fan_Z_mm=0
fan_loops_percent=100
fan_inside_percent=0
fan_cool_percent=100
temperature_C=185
keep_warm_C=150
first_layer_C=185
bed_C=70
sec_per_C_per_C=0
flow_min_mm3_per_s=0.01
flow_max_mm3_per_s=10
destring_suck=1
destring_prime=1
destring_min_mm=1
destring_trigger_mm=100
destring_speed_mm_per_s=20
Z_lift_mm=0
min_layer_time_s=10
wipe_mm=10
cost_per_cm3=0.12
flowrate_tweak=1
fiber_dia_mm=2.87
color=16726272
_printers.ini:
[Mendel90]
bed_STL_filename=
extension=G
cost_per_hour=2.5
g_code_prefix=4D3833203B207573652072656C61746976652064697374616E63657320666F7220657874727573696F6E0A4D31343020533C4245443E203B20736574206265642074656D702062757420646F6E74207761697420666F722069740A473238203B20676F20746F20686F6D6520706F736974696F6E20666F722063616C6962726174696F6E0A
g_code_warm=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
g_code_cool=473120452D31204631323030203B2072657472616374207468652065787472756465720A4D313034205330203B207475726E206F6666206578747275646572206865617465720A
g_code_N_layers=0A
g_code_postfix=4D313430205330203B207475726E206F66662074686520626564206865617465720A473238203B20676F20746F20686F6D6520706F736974696F6E0A4D313037203B207475726E206F6666207468652063617272696167652066616E0A4D3834203B207475726E206F6666206D6F746F72730A4D30203B20656E640A
every_N_layers=0
post_process=NULL
num_extruders=1
firmware_type=1
add_comments=1
fan_on=M106
fan_off=M107
fan_pwm=1
add_m101_g10=0
z_speed_mm_per_s=4
z_settle_mm=0
bed_size_x_mm=200
bed_size_y_mm=200
bed_size_z_mm=200
bed_offset_x_mm=0
bed_offset_y_mm=0
bed_offset_z_mm=0
bed_roughness_mm=0
travel_speed_mm_per_s=200
first_layer_speed_mm_per_s=10
dmax_per_layer_mm_per_s=50
xy_accel_mm_per_s_per_s=1500
lo_speed_perim_mm_per_s=15
lo_speed_solid_mm_per_s=20
lo_speed_sparse_mm_per_s=30
hi_speed_perim_mm_per_s=25
hi_speed_solid_mm_per_s=60
hi_speed_sparse_mm_per_s=75
ext_gain_1=1
ext_material_1=5
ext_axis_1=0
ext_gain_2=1
ext_material_2=0
ext_axis_2=0
ext_gain_3=1
ext_material_3=0
ext_axis_3=0
model_ext=0
support_ext=0
support_body_ext=0
raft_ext=0
solid_loop_overlap_fraction=0.5
The GCode I am using, in plain text (as opposed the the version in the ini file) for those interested can be seen here half way down the comments:
https://plus.google.com/u/0/+DanielBull/posts/D4xvPobmtwm
For those interested, I’ve not had a chance to test different temps yet but I did find some “Kids PVA” which seems to work as well as regular PVA but easily wipes off with water which is awesome 
I am but I didn’t need to. I only bought it to support the author, although saying that I have used some of the extra features such as being able to print multiple items at once a couple of times since.