End mill for resin use

I was suffering from welding at the end mill of TiAIN coat so far, but it is very easy to crack.

Since I purchased the item according to the category calendar, I actually used it more than one month since purchase. The end mill of Φ 0.3 mm purchased at the same time is still unopened. I plan to make printed circuit board soon so I will use it at that time. However, it is still a product of Nisshin Tool (NS). Excellent sharpness, even with 15 mm long neck there is not any blur. I think that it is possible to shave soft metal even from sharpness. This time I bought a blade diameter Φ 1 mm, but this time I would like to purchase a long neck end mill with a blade diameter Φ 2 · 3 mm. Monotaro's plastic end mills are too small. Although it does not appear on hard metal · soft metal · resin, the shape of the blade is slightly different. Monotaro's end mill is the most abundant for soft metals, but the end mill's blade diameter difference is good from 0 to -0.01 to 0.05, but the point that the junk diameter is 0 to 0.1 to 0.3 and the shank crossing error is too large It is a drawback. Depending on the junk method (chuck method), the shank diameter error is proportional to the blade diameter error. Please also increase the system as well as the blade diameter diversion as well as the shank crossing crossing. Thank you.