Micro Swiss SLOTTED cooling block upgrade for Wanhao i3

This is redesigned cooling block for Wanhao i3 with the following improvements:

• Slotted Clamping system
• No set screw to ding and damage thermal tube
• Significantly better heat transfer (this is a big one!!!)
• Easier disassemble and adjustments
• Precise control on bore diameter

This cooling block will work with original PTFE lined hotend, and with our Micro Swiss MK10 Allmetal Hotend.