For those of you that requested a longer throat piece, I’ve worked out a solution which I’m hoping will resolve your issues.
This solution adds a small bushing to the bottom of the throat piece. The bushing goes in between the nozzle and the throat piece inside the heat block. It effectively extends the throat by about 4.3mm; while still leaving enough threads for the throat piece to attache. To install the bushing you have to remove the Teflon liner from the throat piece and insert the extended Teflon liner with the bushing.
Anyone placing a new order will get these bushings included in their order of each hot end. If you want to order these bushings, they’re available on the 3dPrintermods.com site beginning later today. They’re just $3 each including shipping via regular post.
As most of you probably know, the throat pieces I use are standard RepRap parts. They’re commercially available anywhere that sells 3d printer parts. These throat pieces are available in 2 sizes, 26mm and 30mm. The only way to get a longer throat piece would be to custom manufacture them. In the quantities we need, it would be prohibitively expensive. This leaves me with 2 remaining options. 1, I could redesign the heat block. A redesigned heat block in order to extend the throat would see a price increase of about $12 each. A side effect of this redesign would see the nozzle height become easier to adjust. Option 2 would require custom machining the throat pieces to about 36mm in length. The price of the throat pieces would increase to about $16 a piece. The final option is the bushing. This is the lease expensive option and does not require replacing any current components. The only downside to this approach is I’m only able to provide an extension of about 4.3mm.
If anyone has any comments, please let me know, the bushings will be available on 3dprintermods.com starting this afternoon PST. I only have a limited number of these ready to ship, so if stock is low, check back.