Question New problem cutting thick material force is up

How about the condition of the cutting strip?
If it is worn or has a groove in it you won't be able to put enough pressure on the material to get a good cut on thick stuff.
I have not tried but you may be able to take the carriage apart to clean & lube the plunger that moves the blade holder up and down. This used to fix issues I had with an old Roland cutter.

wayne k
guam usa

 

never touched a 8000 series but from my experience of 7000s fc2250 and mx materials.
because you have been doing this for a while presume all normal problems dealt with.
next to the pen up down actuator is a small encoder strip and eye with care blow clean. this sets the depth after the first down of the cut, if dirty depth is compromised.
if you have the adjustment there is a pen block height adjustment that if slipped will do as you described because the block has moved up so normal down travel of the knife is not enough.
cutting mx materials puts quite a lot of strain on these machines warming the materials helps the knife considerably

 

It's not a direct answer to you problem.
But we tend to do two cuts at a lower pressure.
It really helped us.

 

Perf cut 2 passes on same cutter same material once you find the settings you are golden just pop them out.
CB15UA-K30-5 blades are a MUST for this work. They are expensive but they do the job and last.

 

For this kind of work no other blade can do it, it will fix your problem straight away.
Tool is in the perf cutting position.
You need to have those blades, on the cutter set the perf length to 20mm normal cut to 1mm speed no more than 10cm per second or you will snap the tip of the blade.
Force is around 42 but that changes when you replace the blade.
Start on about 35 and move up with increments of 1 per job until you have it right, the jobs will still weed so you wont waste any. it may take you a full day to dial it in and once you have always check they are still popping out.
It can be very frustrating at first and it is a steep learning curve but worth it in the end