Page **1** of **1**

### Tricklaser Ball Cup Arm Length Question

Posted: **Tue Oct 31, 2017 9:43 am**

by **MrSteve920**

I have a question about the arm length on the D300 plus upgrade. It was my understanding that the tricklaser ball cup arms used for the upgrade are 375mm measured from ball center to ball center. However, I noticed that the config file for the 1.19.2 upgrade for the plus on the github is coded for a 379mm diagonal arm length. Where does the additional 4mm come from?

### Re: Tricklaser Ball Cup Arm Length Question

Posted: **Tue Oct 31, 2017 12:20 pm**

by **UltiBots**

379mm was the arm length needed for dimensional print accuracy on our reference D300VS+. It will be a good value to start with.

Quickly... for dimensional accuracy you may need to adjust your diagonal_rod value. Increase the value if actual print size too big and decrease if too small. Use the following formula to correct the diagonal_rod value:

Code: Select all

`new_diagonal_rod = diagonal_rod * (measured_print_size/required_print_size) `

Adjust the value in the config.g file:

### Re: Tricklaser Ball Cup Arm Length Question

Posted: **Tue Dec 19, 2017 12:42 pm**

by **AE9RB**

My arms, all marked 375.0, calibrated to:

### Re: Tricklaser Ball Cup Arm Length Question

Posted: **Sat Jan 06, 2018 6:54 pm**

by **AE9RB**

After further testing it turns out 375.0 for my arms marked 375.0 gives me the right size prints.