Cleaning and preparing the glass print bed

I already experienced that a clean and well prepared print bed can make or break a print. Good preparation leads to good first layers, good adhesion(@110°C) while objects automatically pop off the printbed when it cools down (no banging on printed objects with hammers and breaking glass).

My procedure for printing ABS (for now):

• Clean the glass (while cold) with Acetone and scrape off previous ABS remains (Nail Polish remover will work fine and smells less anoying)
• Clean the glass with regular window cleaner
• Spray 3 layers of extra-ultra-strong hairspray on the cold glass while letting each layer dry. (cut a 20x20cm hole in a shoebox to be able to spray while the glass is mounted on the Prusa frame)
• Re-check Z-axis leveling (I really need to get a automatic leveling thingie)
• Heatbed warmup to 110°C
• Have nice prints!

The important "First Layer" !

I just learned how important the first layer is.
The Z-bed was not properly leveled (too close to the nozzle) and caused 2 prints to be worthless (guess which ones). The objects fall apart when peeling them off the heatbed because the first layers where too thin.

When the bed is leveled properly the printed object comes out fine and doesn't break (bottom-left).

The "hairspray-trick" gives me good adhesion for this size of objects. I'm curious how it will work on large objects.
Hairspray trick = properly clean the glass plate with acetone (or nail polish remover) and spray 3 layers of hairspray while letting each layer dry. Repeat after each print.

The important first layer

Object STL: a letter B drawn in Sketchup for my friend Bjorn who asked to print a B
Material: 3mm ABS
Hotend: 245°C 1st layer, then 240°C
Heatbed: 110°C
Heatbed adhesion: 3 layers of Fructis Bamboo Extract Hairspray, extra hold nr 6
Layer height: 0,2mm & 0.4mm
Nozzle: 0,4mm
Gcode generated with Slic3r and printed with Pronterface